Note that random can be a list:
"a one-sided formula of the form ~x1+...+xn, or a pdMat object with a formula
(i.e. a non-NULL value for formula(object)), or a list of such formulas or pdMat
objects. "
If you can translate that into *informative* English I'd be grateful. I have the
Pinheiro and Bates book under my nose now, and I suspect it's pretty more
extensive that the helpfile, but it's still nowhere close to providing a
straigtforward answer to my question.
Cheers,
Federico
--
Federico C. F. Calboli
Department of Epidemiology and Public Health
Imperial College, St Mary's Campus
Norfolk Place, London W2 1PG
Tel +44 (0)20 7594 1602 Fax (+44) 020 7594 3193
f.calboli [.a.t] imperial.ac.uk
f.calboli [.a.t] gmail.com
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